/Engine/Source/Runtime/Experimental/Chaos/Public/Chaos/PBDRigidsSOAs.h
Used specifically by PBDRigidClustering. These have special properties for maintaining relative order, efficiently switching from kinematic to dynamic, disable to enable, etc...
[TArray](API\Runtime\Core\Containers\TArray)< [FPBDRigidClusteredParticleHandle](API\Runtime\Chaos\Chaos\FPBDRigidClusteredParticleHandle) * > CreateClusteredParticles ( int32 NumParticles, const [FUniqueIdx](API\Runtime\Chaos\Chaos\FUniqueIdx) * ExistingIndices, const [FPBDRigidParticleParameters](API\Runtime\Chaos\Chaos\FPBDRigidParticleParameters) & Params )